Isn't gold traded on commodities exchanges, which are regulated?

Note that the CFTC, which regulates commodities futures trading, is (or was?) considering regulating digital currencies:

https://en.wikipedia.org/wiki/Commodity_Futures_Trading_Comm...

However, it doesn't seem like they've come to a decision yet.

No, the significant markets for gold are very much regulated.

Significant markets for gold are very much regulated, and exchanges listing gold ETFs have surveillance agreements with them.

I think it would apply to foreign currency ETFs, since the foreign exchange markets aren't exchanged-based. Foreign currencies aren't commodities though, so apparently it's completely different situation to a commodity like bitcoin.

Yes this was my question. Do gold ETFs list under the same exchange rule?